Resolves: tdf#124485 [none] is at index 0

rather than the meaning of nothing-selected which is -1

Change-Id: I3be01fa8d6b57f61aa660be5912f479e79cff2b2
Reviewed-on: https://gerrit.libreoffice.org/70142
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/ui/index/cnttab.cxx

@@ -1113,7 +1113,7 @@ void SwTOXSelectTabPage::FillTOXDescription()
         case TOX_AUTHORITIES:
         case TOX_BIBLIOGRAPHY :
         {
-            if (m_xBracketLB->get_active() != -1)
+            if (m_xBracketLB->get_active())
                 rDesc.SetAuthBrackets(m_xBracketLB->get_active_text());
             else
                 rDesc.SetAuthBrackets(OUString());